# Incident 19990728023609I: Piper PA31350, Grand Junction, CO, July 28, 1999

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: July 28, 1999, 20:15 local time
- Place: Grand Junction, CO
- Airport: Walker Field
- Phase of flight: Forced/Precautionary Landing
- Operating rules: Air taxi and commuter (Part 135)
- Operator: MGDA
- Location: 39.0639° N, 108.5506° W: Placed by OpenAirDocs: center of Grand Junction, CO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.0639&lon=-108.5506&mi=10
- Aircraft: N850ST, a cancelled registration (https://openairdocs.org/deregistered/N850ST-2010-10-21) (OpenAirDocs)
- Registry model: Piper PA-31-350 (registry code 7103110, https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Registry engine: Lycoming TI0-540 series (registry code 41533, https://openairdocs.org/engine/lycoming-ti0-540-series) (OpenAirDocs)
- Reported make and model: PIPER PA31350
- Reported engine: LYC TIO540J2BD
- People aboard: 1
- Fatal injuries: 0
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19990728023609I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(-23) AT CRUISE THE RIGHT ENGINE STEADILY LOST POWER AND WAS SHUT DOWN.  THE PILOT DECLARED AN EMERGENCY AND RETURNED TO THE AIRPORT.  WHILE RETURNING, THE PILOT RESTARTED THE ENGINE AS REQUESTED BY MAINTENANCE AND LANDED WITHOUT INCIDENT.  MAINTENANCE FOUND AND REPLACED AN EXCESSIVELY WORN AND LOOSE 10/32 INDUCTION CLAMP NUT WHICH ALLOWED INDUCTION AIR PRESSURE TO ESCAPE CAUSING AN EXCESSIVELY RICH FUEL MIXTURE.  AFTER MAINTENANCE, WHILE CLIMBING DURING THE SECOND DEPARTURE, THE ENGINE AGAIN LOST POWER BUT WAS NOT SHUT DOWN.  THE PILOT DECLARED AN EMERGENCY AND LANDED AT RIFLE, CO. (RIL).  MAINTENANCE FOUND THAT THE SAME CLAMP HAD BROKEN DUPLICATING THE SAME SCENARIO.  THE CLAMP WAS REPLACED AND NO FURTHER PROBLEMS WERE EXPERIENCED.

## Other reports on N850ST (5)

Matched to the same aircraft by N-number and date.

- [Incident 20070201001189I](https://openairdocs.org/incident/20070201001189I), Feb 1, 2007: Piper PA31350 (N850ST), Omaha, NE. (-23) N850ST, PA-31-350, being operated by American check transport as flight 406, had the nose tire go flat on roll out. The aircraft exited the runway and…
- [Incident 20050401014439I](https://openairdocs.org/incident/20050401014439I), Apr 1, 2005: Piper PA31350 (N850ST), Indianapolis, IN, Minor damage. (-23) Act 68 flight, PA-31-350 landed at ind at approximately 0800, 04/01/05. Aircraft was enroute from cvg to ind. As the aircraft was exiting runway 23L the…
- [Incident 19880803045859I](https://openairdocs.org/incident/19880803045859I), Aug 3, 1988: Piper PA31350 (N850ST), Somerville, NJ, Minor damage. Pilot forgot to lower landing gear. Landed with gear up. Minor damage to aircraft.
- [Incident 19790902033869I](https://openairdocs.org/incident/19790902033869I), Sep 2, 1979: Piper PA31350 (N850ST), Boston, MA. Engine quit on final, fuel selector valve was not in detente.
- [Incident 19790719022329I](https://openairdocs.org/incident/19790719022329I), Jul 19, 1979: Piper PA31350 (N850ST), Hyannis, MA. Rough running engine shutdown. Dirt found in fuel injector nozzle.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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